package com.example.util.http;

import com.alibaba.fastjson.JSON;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicHeader;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.net.ssl.*;
import java.io.*;
import java.net.ConnectException;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLConnection;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * 通用http发送方法
 *
 * @author wangkai
 */

public class HttpUtils {

    private static final Logger log = LoggerFactory.getLogger(HttpUtils.class);

    /**
     * 向指定 URL 发送GET方法的请求
     *
     * @param url   发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        StringBuilder result = new StringBuilder();
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            log.info("sendGet - {}", urlNameString);
            URL realUrl = new URL(urlNameString);
            URLConnection connection = realUrl.openConnection();
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            connection.connect();
            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
            log.info("recv - {}", result);
        } catch (ConnectException e) {
            log.error("调用HttpUtils.sendGet ConnectException, url=" + url + ",param=" + param, e);
        } catch (SocketTimeoutException e) {
            log.error("调用HttpUtils.sendGet SocketTimeoutException, url=" + url + ",param=" + param, e);
        } catch (IOException e) {
            log.error("调用HttpUtils.sendGet IOException, url=" + url + ",param=" + param, e);
        } catch (Exception e) {
            log.error("调用HttpsUtil.sendGet Exception, url=" + url + ",param=" + param, e);
        } finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception ex) {
                log.error("调用in.close Exception, url=" + url + ",param=" + param, ex);
            }
        }
        return result.toString();
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url   发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        StringBuilder result = new StringBuilder();
        try {
            String urlNameString = url;
            log.info("sendPost - {}", urlNameString);
            URL realUrl = new URL(urlNameString);
            URLConnection conn = realUrl.openConnection();
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Accept-Charset", "utf-8");
            conn.setRequestProperty("contentType", "utf-8");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            out = new PrintWriter(conn.getOutputStream());
            out.print(param);
            out.flush();
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
            log.info("recv - {}", result);
        } catch (ConnectException e) {
            log.error("调用HttpUtils.sendPost ConnectException, url=" + url + ",param=" + param, e);
        } catch (SocketTimeoutException e) {
            log.error("调用HttpUtils.sendPost SocketTimeoutException, url=" + url + ",param=" + param, e);
        } catch (IOException e) {
            log.error("调用HttpUtils.sendPost IOException, url=" + url + ",param=" + param, e);
        } catch (Exception e) {
            log.error("调用HttpsUtil.sendPost Exception, url=" + url + ",param=" + param, e);
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                log.error("调用in.close Exception, url=" + url + ",param=" + param, ex);
            }
        }
        return result.toString();
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url   发送请求的 URL
     * @param params 请求参数，Map。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, Map<String, String> params) {
        StringBuffer sbParams = new StringBuffer();
        if (params != null && params.size() > 0) {
            for (Map.Entry<String, String> e : params.entrySet()) {
                sbParams.append(e.getKey());
                sbParams.append("=");
                sbParams.append(e.getValue());
                sbParams.append("&");
            }
        }
        return sendPost(url,sbParams.toString());
    }

    /**
     *
     * @param url
     * @param param
     * @return
     */
    public static String sendSSLPost(String url, String param) {
        StringBuilder result = new StringBuilder();
        String urlNameString = url + "?" + param;
        try {
            log.info("sendSSLPost - {}", urlNameString);
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, new TrustManager[]{new TrustAnyTrustManager()}, new java.security.SecureRandom());
            URL console = new URL(urlNameString);
            HttpsURLConnection conn = (HttpsURLConnection) console.openConnection();
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Accept-Charset", "utf-8");
            conn.setRequestProperty("contentType", "utf-8");
            conn.setDoOutput(true);
            conn.setDoInput(true);

            conn.setSSLSocketFactory(sc.getSocketFactory());
            conn.setHostnameVerifier(new TrustAnyHostnameVerifier());
            conn.connect();
            InputStream is = conn.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String ret = "";
            while ((ret = br.readLine()) != null) {
                if (ret != null && !ret.trim().equals("")) {
                    result.append(new String(ret.getBytes("ISO-8859-1"), "utf-8"));
                }
            }
            log.info("recv - {}", result);
            conn.disconnect();
            br.close();
        } catch (ConnectException e) {
            log.error("调用HttpUtils.sendSSLPost ConnectException, url=" + url + ",param=" + param, e);
        } catch (SocketTimeoutException e) {
            log.error("调用HttpUtils.sendSSLPost SocketTimeoutException, url=" + url + ",param=" + param, e);
        } catch (IOException e) {
            log.error("调用HttpUtils.sendSSLPost IOException, url=" + url + ",param=" + param, e);
        } catch (Exception e) {
            log.error("调用HttpsUtil.sendSSLPost Exception, url=" + url + ",param=" + param, e);
        }
        return result.toString();
    }

    private static class TrustAnyTrustManager implements X509TrustManager {
        @Override
        public void checkClientTrusted(X509Certificate[] chain, String authType) {
        }

        @Override
        public void checkServerTrusted(X509Certificate[] chain, String authType) {
        }

        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return new X509Certificate[]{};
        }
    }

    private static class TrustAnyHostnameVerifier implements HostnameVerifier {
        @Override
        public boolean verify(String hostname, SSLSession session) {
            return true;
        }
    }



    /**
     *  请求参数为from格式
     * @param url
     * @param param
     * @return
     */
    public static String sendFromPost(String url,Map<String,String> param){
        return sendFromPost(url,null,param);
    }


    /**
     * 请求参数为from格式
     * @param url
     * @param headers
     * @param param
     * @return
     */
    public static String sendFromPost(String url,Map<String,String> headers,Map<String,String> param){
        String result="";
        //创建httpclient对象
        CloseableHttpClient client = HttpClients.createDefault();
        CloseableHttpResponse response =null;
        try{
            //创建post方式请求对象
            HttpPost  httpPost = new HttpPost(url);
            if(param!=null&&param.keySet().size()>0){
                List<NameValuePair> formParams = new ArrayList<NameValuePair>();
                param.keySet().forEach(key-> formParams.add(new BasicNameValuePair(key, param.get(key))));
                //装填参数
                try {
                    UrlEncodedFormEntity formEntity=new UrlEncodedFormEntity(formParams, "utf-8");
                    httpPost.setEntity(formEntity);
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
            }
            httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
            httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
            httpPost.setHeader("accept", "*/*");
            httpPost.setHeader("connection", "Keep-Alive");
            httpPost.setHeader("Accept-Charset", "utf-8");
            httpPost.setHeader("contentType", "utf-8");
            if(headers!=null&&headers.keySet().size()>0){
                headers.keySet().forEach(key -> httpPost.setHeader(key, headers.get(key)));
            }
            //执行请求操作，并拿到结果（同步阻塞）
             response = client.execute(httpPost);
            //获取结果实体
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                //按指定编码转换结果实体为String类型
                result= EntityUtils.toString(entity, "utf-8");
            }
            EntityUtils.consume(entity);
        }catch (Exception e){
            log.error("from请求异常：{}",e.getMessage());
        }finally {
            try {
                //释放链接
                if(response!=null) response.close();
                if(client!=null) client.close();
            } catch (IOException e) {
                log.error("from请求异常：{}",e.getMessage());
            }
        }
        return result;
    }


    /**
     * 请求参数为json格式
     * @param url
     * @param param
     * @return
     */
    public static String sendJsonPost(String url,Map<String,String> param){


        return sendJsonPost(url,null,param);
    }

    /**
     * 请求参数为json格式
     * @param url
     * @param headers
     * @param param
     * @return
     */
    public static String sendJsonPost(String url, Map<String,String> headers, Map<String,String> param){
        String result = "";
        //创建httpclient对象
        CloseableHttpClient client = HttpClients.createDefault();
        CloseableHttpResponse response =null;
        try{
            //创建post方式请求对象
            HttpPost httpPost = new HttpPost(url);
            if(param!=null&&param.keySet().size()>0){
                //装填参数
                StringEntity stringParam = new StringEntity(JSON.toJSONString(param), "utf-8");
                stringParam.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,"application/json"));
                //设置参数到请求对象中
                httpPost.setEntity(stringParam);
            }
            //设置header信息
            //指定报文头【Content-type】、【User-Agent】
//        httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
            httpPost.setHeader("Content-type", "application/json");
            httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
            httpPost.setHeader("accept", "*/*");
            httpPost.setHeader("connection", "Keep-Alive");
            httpPost.setHeader("Accept-Charset", "utf-8");
            httpPost.setHeader("contentType", "utf-8");
            if(headers!=null&&headers.keySet().size()>0){
                headers.keySet().forEach(key -> httpPost.setHeader(key, headers.get(key)));
            }
            //执行请求操作，并拿到结果（同步阻塞）
             response = client.execute(httpPost);
            //获取结果实体
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                //按指定编码转换结果实体为String类型
                result = EntityUtils.toString(entity, "utf-8");
            }
            EntityUtils.consume(entity);
        }catch (Exception e){
            log.error("POST请求异常：{}",e.getMessage());
        }finally {
            try {
                //释放链接
                if(response!=null) response.close();
                if(client!=null) client.close();
            } catch (IOException e) {
                log.error("POST请求异常：{}",e.getMessage());
            }
        }
        return result;
    }







}
